Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 28, Problem 4RQ
An open-delta three-phase transformer system has one transformer center-tapped to provide a neutral for single-phase voltages. If the voltage from line to center tap is 277 V, what is the high-leg voltage?
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The equivalent circuit impedances of a 20-kVA, 8000/240-V, 60-Hz
transformer are to be determined. The open-circuit test and the short-
circuit test were performed on the primary side of the transformer, and
the following data were taken:
Open-circuit test
(on primary)
Short-circuit test
(on primary)
8000 V
V= 489 V
I0.214 A
2.5 A
P= 400 W
P= 240 W
Find the impedances of the approximate equivalent circuit referred to
the primary side, and sketch the circuit.
Answer only please
The resistance of a transformer winding is 0.25 ohm at 25oC. When operating at full load, the temperature of the winding is 75oC. The temperature coefficient of resistance for copper at 0oC is 0.00427 per oC. What is the winding resistance at full load?
a.
0.512 ohm
b.
0.315 ohm
c.
0.298 ohm
d.
0.271 ohm
Chapter 28 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 28 - How many transformers are needed to make an...Ch. 28 - Two transformers rated at 100 kVA each are...Ch. 28 - How does the NEC specify that the high leg of a...Ch. 28 - An open-delta three-phase transformer system has...Ch. 28 - If a single-phase load is connected across the two...Ch. 28 - A three-phase transformer connection has a...Ch. 28 - A three-phase transformer connection has a...Ch. 28 - A three-phase transformer bank has the secondary...Ch. 28 - A three-phase transformer bank has the primary and...Ch. 28 - Referring to the transformer connection in...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- For an ideal 2-winding transformer, an impedance Z2 connected across winding 2 (secondary) is referred to winding 1 (primary) by multiplying Z2 by (a) The turns ratio (N1/N2) (b) The square of the turns ratio (N1/N2)2 (c) The cubed turns ratio (N1/N2)3arrow_forwardA single-phase, 50-kVA,2400/240-V,60-Hz distribution transformer has the following parameters: Resistance of the 2400-V winding: R1=0.75 Resistance of the 240-V winding: R2=0.0075 Leakage reactance of the 2400-V winding: X1=1.0 Leakage reactance of the 240-V winding: X2=0.01 Exciting admittance on the 240-V side =0.003j0.02S (a) Draw the equivalent circuit referred to the high-voltage side of the transformer. (b) Draw the equivalent circuit referred to the low-voltage side of the transformer. Show the numerical values of impedances on the equivalent circuits.arrow_forwardA single-phase step-down transformer is rated 13MVA,66kV/11.5kV. With the 11.5 kV winding short-circuited, rated current flows when the voltage applied to the primary is 5.5 kV. The power input is read as 100 kW. Determine Req1andXeq1 in ohms referred to the high-voltage winding.arrow_forward
- What are the advantages of correctly specifying a transformer most Suita ble for its application?arrow_forwardIf the secondary side of a dual-voltage single phase transformer, as per figure 1, were to be connected in series, the rated output current would be equal to the -A- current rating of the individual coils, B- sum of the current rating of the individual coils, C- either "a" or "b", D- neither "a" nor "b". If secondary side of the a dual-voltage single phase transformer, as per figure 1, were to be connected in paralle, the rated output current would be equal to the A- current rating of the individual coils, B- sum of the current rating of the individual coils, C- either "a" or "b", D- neither "a" nor "b". The poles of a magnet tend to be____________. A - at the ends of the magnet, B- in the middle of the magnet, C -all around the magnet, D- none of the above.arrow_forwardThe open-circuit voltage of 240V and the full load secondary voltage of 220 V, then the % regulation of a transformer is?arrow_forward
- Example 2-2. The equivalent circuit impedances of a 20-kVA, 8000/240-V, 60-Hz transformer are to be determined. The open-circuit test and the short-circuit test were performed on the primary side of the transformer, and the following data were taken: Open-circuit test (on primary) Short-circuit test (on primary) Voc = 8000 V Vsc = 489 V loc = 0.214 A Isc = 2.5 A Voc = 400 W Ps = 240 Warrow_forwardI need the answer as soon as possiblearrow_forwardDue to the increase in load, what change you saw in the transformer’s output power and voltage regulation?arrow_forward
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